Highest temperature in London on July 24?

Platform comparison

Market context

London’s high at the airport is the relevant settlement print, so the key question is whether the day produces a routine July top-end reading or a proper heat-spike by late morning. The market’s 0% implied probability of **YES** suggests traders are not leaning towards the hotter range at all, which is consistent with the wider July pattern in London: long-run July averages are usually in the low 20s Celsius, with rainfall still common even in summer.[2]

Comparable London summer heat events have shown how quickly odds can shift when a hot spell is locked in by the Met Office. In early July 2026, London reached 34C and the Met Office flagged temperatures of 32C or more through the week, with UKHSA amber heat alerts covering London from 8 July to 12 July.[1][4] By contrast, later July forecasts have pointed back towards more moderate conditions, and heat warnings had already been lifted after an earlier late-June spell.[3] That makes this market heavily dependent on whether the airport station catches any short-lived surge rather than the broader city average.[1][3]

The main catalyst to watch is the near-term Met Office forecast and any updated London heat alerts, because those are what would justify a late-morning move into the higher temperature bands.[1][5] Traders should also watch whether forecasts for London City Airport itself diverge from central-London averages, since coastal or localised breeze effects can keep the airport reading lower even when the city feels hot. If official guidance continues to point to mid-20s or low-30s rather than sustained 34C-plus conditions, the market’s current bias away from the upper ranges should remain intact.[1][2]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in London on July 24? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. For users geo-blocked from Polymarket directly, brokers like Trump Prediction provide a 0%-fee route into the same order book.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

How fast do political markets react to news?

High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.